But yes, if you fly N-regs regularly and thus have to keep an FAA PPL valid in any case the validation procedure for FAA looks simpler than the UK JAA one. Basically because the folks in Oklahoma don't take privacy as seriously as the UK CAA so you don't have to give them permission to release your personal details to the SA or OZ CAA.
Not only that - the process is also much quicker (and free on the FAA end).